CN109988504B - Surface treatment composition containing fluorinated polyether siloxane - Google Patents

Surface treatment composition containing fluorinated polyether siloxane Download PDF

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CN109988504B
CN109988504B CN201910192198.0A CN201910192198A CN109988504B CN 109988504 B CN109988504 B CN 109988504B CN 201910192198 A CN201910192198 A CN 201910192198A CN 109988504 B CN109988504 B CN 109988504B
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fluorinated polyether
polyether siloxane
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CN109988504A (en
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裴金东
李建
郦聪
田小平
郑欣
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QUZHOU FLUORIDE AND SILICON RESEARCH INSTITUTES
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/10—Block or graft copolymers containing polysiloxane sequences
    • C09D183/12—Block or graft copolymers containing polysiloxane sequences containing polyether sequences
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/16—Antifouling paints; Underwater paints
    • C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
    • C09D5/1662—Synthetic film-forming substance
    • C09D5/1675—Polyorganosiloxane-containing compositions
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/16—Antifouling paints; Underwater paints
    • C09D5/1687—Use of special additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Paints Or Removers (AREA)
  • Polyethers (AREA)

Abstract

The invention discloses a fluorinated polymerA surface treatment composition of an ethersiloxane, the composition comprising: (1)70 to 99.99 parts by mass of a fluorinated polyether siloxane represented by general formulae (A) and (B): (R)f)α‑M‑(S)β(A)(S)β‑M‑(Rf)‑M‑(S)β(B) Wherein R isfIs a monovalent or divalent polyfluoropolyether group, M is a covalent bond or an at least divalent organic linking group, S is a silyl group containing a hydroxyl group or a hydrolyzable group, both alpha and beta are integers of 1-10, and alpha + beta is less than or equal to 10; and the fluorinated polyether siloxane represented by the formula (B) accounts for 35% of the total mass of the fluorinated polyether siloxane at most; (2) 0.01-30 parts by mass of a silane compound containing both amino and hydroxyl or a hydrolyzable group. The antifouling coating prepared from the composition has excellent antifouling property and wear resistance, can be cured at room temperature, and has good smoothness and excellent hand feeling.

Description

Surface treatment composition containing fluorinated polyether siloxane
Technical Field
The invention relates to a surface treatment composition, in particular to a surface treatment composition containing fluorinated polyether siloxane, belonging to the technical field of surface treatment.
Background
Transparent optical devices (such as mobile phone glass screens and the like) of touch electronic display devices are frequently contacted with fingers and are easily polluted by fingerprints, sweat, oil stains and the like, and once the dirt is formed, the dirt is difficult to remove under the condition of not using a solvent, and the risk of damaging the display devices due to the use of the solvent is also caused; on the other hand, dirt also affects the visual perception of the display device. In order to prevent the pollution of the dirt to the display device and the possible damage to the device in the process of removing the dirt, it is of great significance to develop the surface coating with the functions of preventing the dirt and easily removing the dirt.
To achieve the above objectives, researchers have developed a variety of fluorinated silicone anti-soil products. The hydrolytic condensation of siloxane groups and the base material form chemical crosslinking, so that the binding power of the coating is improved; the use of fluorinated organic groups bonded to the siloxane provides an anti-fouling effect.
In order to prevent the optical performance of the optical member from being affected, it is generally required that the surface antifouling layer of the optical member is extremely thin. In addition, with the increasing demand of people for product quality, the demand of durability of the surface antifouling property of the optical component is higher and higher, and the existing fluorinated siloxane coating is difficult to meet the demand of high abrasion resistance.
Meanwhile, due to the requirements of the production process, some optical component manufacturers put forward a new requirement of room temperature curing. However, the existing fluorinated siloxanes are cured at high temperatures of above 120 ℃ to meet the requirement of high abrasion resistance.
Disclosure of Invention
The invention aims to provide a surface treatment composition containing fluorinated polyether siloxane, an antifouling coating formed by the composition has excellent antifouling performance, good smoothness and wear resistance, and the composition can be cured at room temperature to form a coating with excellent wear resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a surface treatment composition comprising a fluorinated polyether siloxane, wherein the composition comprises: (1)70 to 99.99 parts by mass of a fluorinated polyether siloxane represented by the general formulae (A) and (B):
(Rf)α-M-(S)β (A)
(S)β-M-(Rf)-M-(S)β (B)
(2) 0.01-30 parts by mass of a silane compound containing both amino and hydroxyl or a hydrolyzable group.
The fluorinated polyether siloxanes can be obtained by any possible means, such as hydrosilylation, Grignard, amidation, isocyanate, polyfluoropolyether iodide addition, free radical and cationic polymerization methods, and combinations thereof. And the fluorinated polyether siloxane represented by the formula (B) in the fluorinated polyether siloxane accounts for 35% of the total mass of the fluorinated polyether siloxane at most, otherwise, the contact angle of the coating is reduced, the antifouling property is difficult to achieve the expected effect, and the smooth hand feeling and the wear resistance of the coating are reduced to different degrees.
Meanwhile, the silane compound containing amino and hydroxyl or a hydrolyzable group has important influence on room temperature curing and improvement of wear resistance, and the component is difficult to achieve the expected effect when not in existence; however, when the amount of the component exceeds 30 parts by mass, the cured film becomes gradually brittle to deteriorate the hand feeling, and the stain-proofing effect and the abrasion resistance are also deteriorated to various degrees.
Further, the fluorinated polyether siloxanes may be represented by the following general formulae a1, B1, a2, and B2:
Rf-M-(-N-SiR1 aR2 3-a)β (A1)
(R2 3-aR1 aSi-N-)β-M-(Rf)-M-(-N-SiR1 aR2 3-a)β (B1)
Rf-M-(-N-SiR1 aR2 3-a-b Tb)β (A2)
(Tb R2 3-aR1 aSi-N)β-M-(Rf)-M-(-N-SiR1 aR2 3-a-bTb)β (B2)
in the formula, RfIs a monovalent or divalent polyfluoropolyether group, M is a covalent bond or an at least divalent organic linking group, N is a covalent bond or a divalent organic linking group, beta is an integer of 1 to 10, and represents-Q-SiR each time T appears1 aR2 3-a-b T′bEach time Q is present, it represents a divalent organic group, T' has the same meaning as T, R in the formulae1Is C1～8Alkyl of R2Is a hydroxyl or hydrolysable group, a is 0, 1 or 2, b is 0, 1, 2 or 3, and b is 0 only when terminal Si is present.
Further, the fluorinated polyether siloxane may be represented by formulas 1 to 5:
Rf-CH2OCH2CH2CH2Si(OCH3)3 (1)
(CH3O)3SiCH2CH2CH2OCH2-Rf-CH2OCH2CH2CH2Si(OCH3)3 (2)
Rf-CH2OCH2CH2CH2Si(CH2CH2CH2Si(OCH3)3) 3(3)
((CH3O)3SiCH2CH2CH2)3SiCH2CH2CH2OCH2-Rf-CH2OCH2CH2CH2Si(CH2CH2CH2Si(OCH3)3)3 (4)
Rf-CH2OCH2CH2CH2Si(CH2CH2CH2SiCH3(CH2CH2CH2SiCH3(OCH3)2)3 (5)
in the formula, RfIs a monovalent or divalent polyfluoropolyether group.
The polyfluoropolyether can be K type, D type, Y type and Z type, wherein the K type is obtained by anionic ring-opening hexafluoropropylene oxide polymerization (mainly contains- (CF)3)CF2Structural unit of O) -), form D is obtained by anionic ring-opening tetrafluoroepoxybutane polymerization and re-fluorination (mainly containing- (CF)2CF2CF2CF2Structural unit of O) -), Y-type obtained by photooxidative radical polymerization of hexafluoropropylene (mainly containing- (CF))3)CF2O)-、-(CF2O) -and- (CF)3) Structural unit of O) -), Z-form is obtained by photooxidation of tetrafluoroethylene with a radical (mainly containing- (CF)2CF2O) -and- (CF)2O) -) and polyfluoroalkyl polyether (mainly containing- (CF) by photoradical copolymerization of hexafluoropropylene and tetrafluoroethylene)3)CF2O)-、-(CF(CF3)O)-、-(CF2O) -and- (CF)2CF2Structural unit of O) -). The number average molecular weight of the polyfluoropolyether group is generally 2000 to 10000, preferably 3000 to 8500, and more preferably 4000 to 7000; wherein the molecular weight is less than 2000The mole percentage should be controlled below 10%, preferably below 5%.
Further, silane compounds containing both amino groups and hydroxyl groups or hydrolyzable groups can be represented by general formulas 6 to 8:
NH2CH2CH2CH2SiR1 aR2 3-a (6)
NH(CH2CH2CH2SiR1 aR2 3-a)2 (7)
NH2CH2CH2NHCH2CH2CH2SiR1 aR2 3-a (8)
in the formula, R in the formula1Is C1～8Alkyl of R2Is hydroxyl or a hydrolyzable group, and a is 0 or 1.
Further, the silane compound having both an amino group and a hydroxyl group or a hydrolyzable group is selected from NH2CH2CH2CH2Si(OCH3)3、NH(CH2CH2CH2Si(OCH3)3)2One kind of (1).
Further, the surface treatment composition containing the fluorinated polyether siloxane further contains an inert fluorine oil having a ratio of a weight average molecular weight to a number average molecular weight of not more than 1.1, wherein the inert fluorine oil is not more than 15 parts by mass relative to 100 parts by mass of a composition of the fluorinated polyether siloxane and a silane compound containing both an amino group and a hydroxyl group or a hydrolyzable group. The inert fluorine oil is fluorine oil which does not contain easily-reactive functional groups, such as hydroxyl, carboxyl, amino and other groups containing active hydrogen, siloxane groups, peroxy groups and the like, and the end group of the inert fluorine oil is trifluoromethyl or difluoromethyl and the like. The number average molecular weight of the inert fluorine oil is 2000-20000, preferably 2500-12000, more preferably 3000-7000. The ratio of the weight average molecular weight to the number average molecular weight (molecular weight dispersion coefficient) of the inert fluorine oil is controlled to be 1.35 or less, preferably 1.15 or less, and more preferably 1 to 1.1. The dispersion coefficient is broad, and the cured film is liable to fog to affect the transparency. The abrasion resistance was drastically reduced after the inert fluorine oil exceeded 15 parts by mass with respect to 100 parts by mass of the composition of the fluorinated polyether siloxane and the silane compound containing both amino groups and hydroxyl groups or hydrolyzable groups.
Still further, the inert fluorine oil is not more than 5 parts by mass relative to 100 parts by mass of a composition of the fluorinated polyether siloxane and the silane compound containing both an amino group and a hydroxyl group or a hydrolyzable group.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) the antifouling coating formed by the composition has excellent antifouling performance;
(2) the composition is composed of two components, and the two components can be cured at room temperature with the aid of an amino component to form a room-temperature-cured antifouling coating with excellent wear resistance;
(3) the house coating formed by the composition after high-temperature curing has excellent wear resistance;
(4) the antifouling coating prepared from the composition has good smoothness and excellent hand feeling.
Detailed Description
The invention provides a surface treatment composition containing fluorinated polyether siloxane, which comprises the fluorinated polyether siloxane and one of silane compounds containing both amino and hydroxyl or hydrolysable groups. The composition contains the two components, so that the wear resistance of a coating formed by the composition is better with the aid of the amino component; meanwhile, the purpose of room temperature curing can be realized, any single component can be cured at room temperature, but the formed coating has extremely poor wear resistance, the wear resistance times are not more than 500, and a room temperature cured thin layer with excellent wear resistance can be formed under the combined action of the two components.
The raw materials used in the tests were as follows:
first, fluorinated polyether siloxane:
A)Rf-CH2OCH2CH2CH2Si(OCH3)3
B)(CH3O)3SiCH2CH2CH2OCH2-Rf-CH2OCH2CH2CH2Si(OCH3)3
C)Rf-CH2OCH2CH2CH2Si(CH2CH2CH2Si(OCH3)3)3
D)((CH3O)3SiCH2CH2CH2)3SiCH2CH2CH2OCH2-Rf-CH2OCH2CH2CH2Si
(CH2CH2CH2Si(OCH3)3)3
E)Rf-CH2OCH2CH2CH2Si(CH2CH2CH2SiCH3(CH2CH2CH2SiCH3(OCH3)2)3
wherein A) is the compound of synthetic example 2 in patent CN201310473099.2, RfIs C3F7O(CF2CF2CF2O)21CF2CF2-; B) synthesized by the method of example 1 in patent CN201080050721.3, and the starting material is- (CF)3)CF2O)m(CF2O)n((CF3)CFO)pCF2The number average molecular weight is 5000, no double bond peak is found in the nuclear magnetic resonance spectrum analysis after hydrosilylation, the PH value test after methoxylation shows neutrality, which indicates that SiCl bond does not exist; C) is the compound in the patent CN201380057304.5 in the synthesis example 4, RfIs C3F7O(CF2CF2CF2O)20CF2CF2-; D) synthesized by adopting the procedures of synthetic examples 1-4 in patent CN201380057304.5, wherein the starting material is- (CF)3)CF2O)m(CF2O)n((CF3)CFO)pCF2-, number average molecular weight 5000, siliconThe analysis of the nuclear magnetic resonance spectrum after the hydrogen addition does not find that a double bond peak exists, and the PH value test after the methoxylation shows that the double bond peak is neutral, which indicates that the SiCl bond does not exist; E) prepared by the method in patent CN201710796436.X, wherein R isfIs CF3O(CF(CF3)CF2O)m(CF2O)n(CF(CF3)O)pCF(CF3) The number average molecular weight is 6000, no double bond peak is found in the nuclear magnetic resonance spectrum analysis after the hydrosilylation, and the PH value test shows neutrality after the methoxylation, which indicates that the SiCl bond does not exist.
Di, amino siloxane compound
F)NH2CH2CH2CH2Si(OCH3)3(commercially available product)
G)NH(CH2CH2CH2Si(OCH3)3)2(commercially available product)
Third, inert fluorine oil
H)CF(CF3)CF2O(CF(CF3)CF2O)mCF2CF3，Mn3000g/mol, Mw/Mn 1.05. (commercially available product)
Example 1
90 parts by mass of fluorinated polyether siloxane A) and 10 parts by mass of aminosiloxane compound H were dissolved in hydrofluoroether solvent 347, and a test solution having a concentration of 1% by weight was prepared.
The preparation methods of examples 2-10 and comparative examples 1-6 are the same as example 1, and the specific ratios of the effective components are shown in Table 1.
Table 1: ratio of effective components (in the table, in parts by mass)
Examples A B C D E F G H
1 90 10
2 70 30
3 99.9 0.01
4 85 15
5 85 15
6 85 15
7 68 17 15
8 68 17 15
9 55.25 29.75 15
10 68 17 15 5
Comparative example
1 100
2 50 50
3 68 32
4 68 16 16
5 54.5 30.5 15
6 85 15 16
Formation of coating (spray treatment):
performing surface plasma treatment on the cleaned toughened glass in the first phase, uniformly spraying the surface treating agent prepared in the examples 1-13 and the comparative examples 1-10 on the surface of the toughened glass through a spraying device, and standing and curing for 5 hours at the temperature of 25 ℃ and the humidity of 70% to form a surface treatment room-temperature curing layer; or curing at 120 deg.C for 40min to form a surface-treated high-temperature cured layer.
Performance evaluation:
first, evaluation of Friction durability
For the formed surface-treated layer, the static contact angle of water was measured (1. mu.L of water drop using a contact angle measuring apparatus of Shanghai Square-Ray instruments Co., Ltd.).
First, as an initial evaluation, after the surface treatment layer was formed, the static contact angle of water was measured in a state where the surface was not yet contacted (the number of times of rubbing was 0). Then, as the friction durability evaluation, steel wool friction durability evaluation was performed. Specifically, the base material on which the surface treatment layer was formed was horizontally arranged, steel wool (contact area 1mm × 1mm) was placed on the upper surface of the surface treatment layer, a load of 1Kgf was applied thereto, and then the steel wool was horizontally rubbed at a wiping speed of 50 cycles/min in a state where the load was applied. The static contact angle of water was measured every 1000 cycles (the evaluation was stopped when the measured value of the contact angle was less than 105 °), but when the number of abrasion resistance was less than 1000 cycles, the static contact angle of water was measured every 100 cycles. The maximum number of round trips while maintaining the contact angle measurement value at a value of 105 ° are shown in table 2.
Evaluation of antifouling Properties
Testing with an oil pen: an oil pen is used for drawing a line on the mobile phone glass screen coating film, then the change of the ink trace is carefully observed, and the evaluation is carried out according to the following standard.
E: ink fast shrinkage
F: partial ink shrinkage
NG: the ink does not shrink basically
The results of the performance tests of examples 1 to 10 and comparative examples 1 to 6 are shown in Table 2.
Table 2: results of Performance testing
Figure BDA0001994693110000071
Figure BDA0001994693110000081
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made on the basis of the present invention to solve the same technical problems and achieve the same technical effects are all covered in the protection scope of the present invention.

Claims (5)

1. A surface treatment composition comprising a fluorinated polyether siloxane, wherein the composition comprises:
(1) 70-99.99 parts by mass of a fluorinated polyether siloxane consisting of A and B, which can be represented by the general formulae A1, B1, A2 and B2:
Rf-M-(-N-SiR1 aR2 3-a)β (A1)
(R2 3-aR1 aSi-N-)β-M-(Rf)-M-(-N-SiR1 aR2 3-a)β (B1)
Rf-M-(-N-SiR1 aR2 3-a-bTb)β (A2)
(TbR2 3-a-bR1 aSi-N)β-M-(Rf)-M-(-N-SiR1 aR2 3-a-bTb)β (B2)
in the formula, RfIs a monovalent or divalent polyfluoropolyether group, M is a covalent bond or an at least divalent organic linking group, N is a covalent bond or a divalent organic linking group, and beta is an integer of 1-10; each time T appears, it represents-Q-SiR1 aR2 3-a-bT′bEach occurrence of Q represents a divalent organic group, and T' has the same meaning as T; in the formulae R1Is C1～8Alkyl of R2Is hydroxy or a hydrolysable group, a is 0, 1 or 2, b is 0, 1, 2 or 3, and b is 0 only when terminal Si is present; and the fluorinated polyether siloxanes represented by formulae (B1) and (B2) represent up to 35% of the total mass of the fluorinated polyether siloxane;
(2) 0.01-30 parts by mass of a silane compound simultaneously containing an amino group and a hydroxyl group or a hydrolyzable group;
(3) and an inert fluorine oil having a ratio of weight average molecular weight to number average molecular weight of not more than 1.1, wherein the inert fluorine oil is not more than 15 parts by mass relative to 100 parts by mass of a composition of the fluorinated polyether siloxane and the silane compound containing both an amino group and a hydroxyl group or a hydrolyzable group.
2. A surface treatment composition comprising a fluorinated polyether siloxane according to claim 1, wherein: the fluorinated polyether siloxane can be represented by formulas 1-5:
Rf-CH2OCH2CH2CH2Si(OCH3)3 (1)
(CH3O)3SiCH2CH2CH2OCH2-Rf-CH2OCH2CH2CH2Si(OCH3)3 (2)
Rf-CH2OCH2CH2CH2Si(CH2CH2CH2Si(OCH3)3)3 (3)
((CH3O)3SiCH2CH2CH2)3SiCH2CH2CH2OCH2-Rf-CH2OCH2CH2CH2Si(CH2CH2CH2Si(OCH3)3)3 (4)
Rf-CH2OCH2CH2CH2Si(CH2CH2CH2SiCH3(CH2CH2CH2SiCH3(OCH3)2)3 (5)
in the formula, RfIs a monovalent or divalent polyfluoropolyether group.
3. A surface treatment composition comprising a fluorinated polyether siloxane according to claim 1, wherein: the silane compound containing both amino and hydroxyl or a hydrolyzable group can be represented by general formulas 6 to 8:
NH2CH2CH2CH2SiR1 aR2 3-a (6)
NH(CH2CH2CH2SiR1 aR2 3-a)2 (7)
NH2CH2CH2NHCH2CH2CH2SiR1 aR2 3-a (8)
in the formula, R in the formula1Is C1～8Alkyl of R2Is hydroxyl or a hydrolyzable group, and a is 0 or 1.
4. A surface treatment composition comprising a fluorinated polyether siloxane according to claim 3, wherein: the silane compound containing both amino and hydroxyl or hydrolyzable groups is selected from NH2CH2CH2CH2Si(OCH3)3、NH(CH2CH2CH2Si(OCH3)3)2One kind of (1).
5. A surface treatment composition comprising a fluorinated polyether siloxane according to claim 1, wherein: the inert fluorine oil is not more than 5 parts by mass relative to 100 parts by mass of a composition of a fluorinated polyether siloxane and an amino group-containing fluorinated polyether compound or a silane compound containing both an amino group and a hydroxyl group or a hydrolyzable group.
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